In the article we show that nondieomorphic symplectic 4-manifolds which admit marked Lefschetz fibrations can share the same monodromy group. Explicitly we prove that, for each integer g > 0, every knot surgery 4-manifold in a family { is a bered 2-bridge knot of genus g in } admits a marked Lefschetz fibration structure which has the same monodromy group.